Malicious PDF — malware analysis report

Static analysis result for SHA-256 651736f0ac5c5b2f…

MALICIOUS

PDF

119.0 KB Created: 2021-04-08 02:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e5b5c3e127deb877080d06370e5279a5 SHA-1: 573aeb7fcfbbc47d30d7132e3e0f0cf282368e5b SHA-256: 651736f0ac5c5b2fc3afadc97efb774f7c492aab48582cd2039bd3f9b83f6d15
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mezovuduw.ru/wix?keyword=dragalia+lost+diamantium+hack PDF link annotation
    • https://cdn.sqhk.co/sonometa/giA0oBr/84198372365.pdfIn PDF document text
    • https://cdn.sqhk.co/guzupewad/nUWor66/pagine.pdfIn PDF document text
    • https://jizexukufi.weebly.com/uploads/1/3/4/1/134109318/faxaxuxonigi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403120/normal_602293a526bbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388813/normal_5fedfdf5dd879.pdfIn PDF document text
    • http://alsamcctv.com/venn_diagrams_maths_ks1awizw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379230/normal_5fec7a4c4d3c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390366/normal_60533611c0bea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490746/normal_5fcecfe3b53ea.pdfIn PDF document text
    • http://shtancircul.site/luxonedalozakebewadewulozhj1ma.pdfIn PDF document text
    • http://nexipufogavajid.getenjoyment.net/pdf_editor_online_delete_text_free.pdfIn PDF document text
    • https://cdn.sqhk.co/jabupexipa/aFhiJPf/scenario_lyrics_bts.pdfIn PDF document text
    • https://giloxegikejuzun.weebly.com/uploads/1/3/4/7/134712531/7102823.pdfIn PDF document text
    • http://idealsit.fun/16352656460rrxps.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_35b5f2f7ad6c42a28d0491bedbfe96c9.pdf?index=trueIn PDF document text
    • https://83bd47e3-138d-48d8-8d00-514fe13b91b0.filesusr.com/ugd/c87a2f_4b0f8c27274a43f49897e28dbf665ab5.pdf?index=trueIn PDF document text
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_13675323a45546f5a840d575016c194b.pdf?index=trueIn PDF document text
    • http://rojanesifilagu.myartsonline.com/51511765108.pdfIn PDF document text
    • http://naburonip.myartsonline.com/or3gun_mossberg_930_upgrades.pdfIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_f45f6e75e3814ce588978e1e03adbc07.pdf?index=trueIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_28414b0ed42749bbbdaac73ad1e1cd4f.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000185ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185BA 5416 bytes
SHA-256: c2a66494deaa65c9e9525392dab364707a1224cba3d8645259f135e742775835
font_01_sfnt_off000197f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197F3 6148 bytes
SHA-256: 0b38f6fd5e0b54bfa22d5adee1cfe00629fe134100fc7cfc1ad14a2ab7974207
font_02_sfnt_off0001a7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7D3 11152 bytes
SHA-256: 51e8da31c49a96b29ea5ae1ea4401ba422bd51d813a8c713e1e809bbb5cd3471